--- /dev/null
+{
+ "cells": [
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "import os,sys,inspect\n",
+ "currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))\n",
+ "parentdir = os.path.dirname(currentdir)\n",
+ "sys.path.insert(0,parentdir) "
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "from cipher.caesar import *\n",
+ "from cipher.affine import *\n",
+ "from cipher.keyword_cipher import *\n",
+ "from cipher.column_transposition import *\n",
+ "from cipher.vigenere import *\n",
+ "from support.text_prettify import *\n",
+ "from support.utilities import *\n",
+ "from support.plot_frequency_histogram import *\n",
+ "import re"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 3,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "challenge_number = 8\n",
+ "plaintext_a_filename = f'{challenge_number}a.plaintext'\n",
+ "plaintext_b_filename = f'{challenge_number}b.plaintext'\n",
+ "ciphertext_a_filename = f'{challenge_number}a.ciphertext'\n",
+ "ciphertext_b_filename = f'{challenge_number}b.ciphertext'"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "ca = open(ciphertext_a_filename).read()\n",
+ "cb = open(ciphertext_b_filename).read()\n",
+ "\n",
+ "rwa = wcat(cat(reversed(w)) for w in ca.split())\n",
+ "ra = cat(reversed(ca))\n",
+ "sca = sanitise(ca)\n",
+ "rsca = cat(reversed(sca))\n",
+ "pca = letters(ca)\n",
+ "pta = depunctuate(ca)\n",
+ "\n",
+ "scb = sanitise(cb)\n",
+ "pcb = letters(cb)\n",
+ "rscb = cat(reversed(scb))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 5,
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stderr",
+ "output_type": "stream",
+ "text": [
+ "/usr/local/lib/python3.6/dist-packages/matplotlib/figure.py:445: UserWarning: Matplotlib is currently using module://ipykernel.pylab.backend_inline, which is a non-GUI backend, so cannot show the figure.\n",
+ " % get_backend())\n"
+ ]
+ },
+ {
+ "data": {
+ "image/png": "iVBORw0KGgoAAAANSUhEUgAAAbAAAAEmCAYAAAADccV0AAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAALEgAACxIB0t1+/AAAADl0RVh0U29mdHdhcmUAbWF0cGxvdGxpYiB2ZXJzaW9uIDMuMC4yLCBodHRwOi8vbWF0cGxvdGxpYi5vcmcvOIA7rQAAFWNJREFUeJzt3X+wZGV95/H3JwyoYCLCXAky6GDEZNGsCw4sLnELQRNUzLC1xIVoAJfUrFmMJsYYiJvFskIVRmtdtzYxmQgLbliEEBU2apQdUPwFOAwgM4AyKyAzBcxFlAhU+PndP/qw1cwP+tzuvsw8c9+vqlvT5+nn6fPtvt396efpc8+kqpAkqTU/s70LkCRpHAaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSYu2dwEAixcvrqVLl27vMiRJO4DrrrvuvqqaGdVvhwiwpUuXsnr16u1dhiRpB5Dkzj79XEKUJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1aWSAJTk3yaYkazdr/90ktyZZl+TPhtrPSLI+yfeS/Np8FC1JUp9TSZ0H/Hfg0081JHk9sBx4dVU9kuRFXftBwAnAK4EXA/8nySuq6olpFy5Jmn9LT/9C7753nP2WeaxkSyNnYFV1FXD/Zs2/A5xdVY90fTZ17cuBz1TVI1V1O7AeOGyK9UqSBIz/HdgrgNcluSbJ15Ic2rXvB9w11G9D1yZJ0lSNezb6RcBewOHAocDFSV42lxtIsgJYAfCSl7xkzDIkSQvVuDOwDcBna+Ba4ElgMbAR2H+o35KubQtVtbKqllXVspmZkf/tiyRJTzNugH0eeD1AklcAuwH3AZcBJyR5TpIDgAOBa6dRqCRJw0YuISa5EDgSWJxkA3AmcC5wbndo/aPAyVVVwLokFwM3A48Dp3kEoiRpPowMsKo6cRtXvWMb/c8CzpqkKEmSRhn3IA5JUmN25L/pGoenkpIkNckAkyQ1yQCTJDXJ78AkqTE723dZ43IGJklqkgEmSWqSS4iStJ24FDgZZ2CSpCY5A5OkKXA29ewzwCRpiEHUDpcQJUlNMsAkSU0ywCRJTTLAJElN8iAOSTslD8bY+TkDkyQ1yQCTJDXJJURJOzSXArUtBpikZ41hpGlyCVGS1CQDTJLUpJFLiEnOBY4FNlXVqza77g+AjwEzVXVfkgCfAN4MPAycUlVrpl+2pO3JpUDtCPrMwM4Djtm8Mcn+wK8CPxxqfhNwYPezAvjk5CVKkrSlkQFWVVcB92/lqo8DHwBqqG058OkauBrYM8m+U6lUkqQhY30HlmQ5sLGqbtzsqv2Au4a2N3RtW7uNFUlWJ1k9Ozs7ThmSpAVszgGWZHfgj4H/PMmOq2plVS2rqmUzMzOT3JQkaQEa5+/AfgE4ALhxcMwGS4A1SQ4DNgL7D/Vd0rVJmmfjHFjhwRhq2ZxnYFV1U1W9qKqWVtVSBsuEh1TVPcBlwEkZOBx4oKrunm7JkiT1O4z+QuBIYHGSDcCZVXXONrp/kcEh9OsZHEb/zinVKS0YzoqkfkYGWFWdOOL6pUOXCzht8rIkSXpmnolDktQkA0yS1CTPRq8FZdzvlzzCT9rxOAOTJDXJAJMkNcklRDXJ5TlJzsAkSU1yBqbtypmUpHEZYJoaw0jSs8klRElSkwwwSVKTDDBJUpMMMElSkzyIYyf2bJ42SZKebQbYs8xQkaTpcAlRktQkZ2B4pnFJapEzMElSkwwwSVKTDDBJUpMMMElSk0YGWJJzk2xKsnao7aNJbk3y3SSfS7Ln0HVnJFmf5HtJfm2+CpckLWx9ZmDnAcds1nY58Kqq+ufA94EzAJIcBJwAvLIb8xdJdplatZIkdUYGWFVdBdy/WdtXqurxbvNqYEl3eTnwmap6pKpuB9YDh02xXkmSgOl8B/bvgS91l/cD7hq6bkPXJknSVE0UYEk+CDwOXDDG2BVJVidZPTs7O0kZkqQFaOwAS3IKcCzw9qqqrnkjsP9QtyVd2xaqamVVLauqZTMzM+OWIUlaoMYKsCTHAB8Afr2qHh666jLghCTPSXIAcCBw7eRlSpL0dCPPhZjkQuBIYHGSDcCZDI46fA5weRKAq6vqXVW1LsnFwM0MlhZPq6on5qt4SdLCNTLAqurErTSf8wz9zwLOmqQoSZJG8UwckqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJo08E0dLlp7+hd597zj7LfNYiSRpvjkDkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNWlkgCU5N8mmJGuH2vZKcnmS27p/X9i1J8l/S7I+yXeTHDKfxUuSFq4+M7DzgGM2azsdWFVVBwKrum2ANwEHdj8rgE9Op0xJkp5uZIBV1VXA/Zs1LwfO7y6fDxw31P7pGrga2DPJvtMqVpKkp4z7Hdg+VXV3d/keYJ/u8n7AXUP9NnRtW0iyIsnqJKtnZ2fHLEOStFBNfBBHVRVQY4xbWVXLqmrZzMzMpGVIkhaYcQPs3qeWBrt/N3XtG4H9h/ot6dokSZqqcQPsMuDk7vLJwKVD7Sd1RyMeDjwwtNQoSdLULBrVIcmFwJHA4iQbgDOBs4GLk5wK3Am8rev+ReDNwHrgYeCd81CzJEmjA6yqTtzGVUdvpW8Bp01alCRJo3gmDklSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMMMElSkwwwSVKTDDBJUpMmCrAkv59kXZK1SS5M8twkByS5Jsn6JBcl2W1axUqS9JSxAyzJfsB7gGVV9SpgF+AE4CPAx6vq5cCPgVOnUagkScMmXUJcBDwvySJgd+Bu4Cjgku7684HjJtyHJElbGDvAqmoj8DHghwyC6wHgOuAnVfV4120DsN+kRUqStLlJlhBfCCwHDgBeDOwBHDOH8SuSrE6yenZ2dtwyJEkL1CRLiG8Abq+q2ap6DPgscASwZ7ekCLAE2Li1wVW1sqqWVdWymZmZCcqQJC1EkwTYD4HDk+yeJMDRwM3AlcDxXZ+TgUsnK1GSpC1N8h3YNQwO1lgD3NTd1krgj4D3JVkP7A2cM4U6JUl6mkWju2xbVZ0JnLlZ8w+Awya5XUmSRvFMHJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCYZYJKkJhlgkqQmGWCSpCZNFGBJ9kxySZJbk9yS5LVJ9kpyeZLbun9fOK1iJUl6yqQzsE8A/1BVvwS8GrgFOB1YVVUHAqu6bUmSpmrsAEvyAuBfA+cAVNWjVfUTYDlwftftfOC4SYuUJGlzk8zADgBmgf+R5Pokn0qyB7BPVd3d9bkH2GfSIiVJ2twkAbYIOAT4ZFUdDDzEZsuFVVVAbW1wkhVJVidZPTs7O0EZkqSFaJIA2wBsqKpruu1LGATavUn2Bej+3bS1wVW1sqqWVdWymZmZCcqQJC1EYwdYVd0D3JXkF7umo4GbgcuAk7u2k4FLJ6pQkqStWDTh+N8FLkiyG/AD4J0MQvHiJKcCdwJvm3AfkiRtYaIAq6obgGVbueroSW5XkqRRPBOHJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJBpgkqUkGmCSpSQaYJKlJEwdYkl2SXJ/k77vtA5Jck2R9kouS7DZ5mZIkPd00ZmDvBW4Z2v4I8PGqejnwY+DUKexDkqSnmSjAkiwB3gJ8qtsOcBRwSdflfOC4SfYhSdLWTDoD+6/AB4Anu+29gZ9U1ePd9gZgvwn3IUnSFsYOsCTHApuq6roxx69IsjrJ6tnZ2XHLkCQtUJPMwI4Afj3JHcBnGCwdfgLYM8mirs8SYOPWBlfVyqpaVlXLZmZmJihDkrQQjR1gVXVGVS2pqqXACcAVVfV24Erg+K7bycClE1cpSdJm5uPvwP4IeF+S9Qy+EztnHvYhSVrgFo3uMlpVfRX4anf5B8Bh07hdSZK2xTNxSJKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmmSASZKaZIBJkppkgEmSmjR2gCXZP8mVSW5Osi7Je7v2vZJcnuS27t8XTq9cSZIGJpmBPQ78QVUdBBwOnJbkIOB0YFVVHQis6rYlSZqqsQOsqu6uqjXd5Z8CtwD7AcuB87tu5wPHTVqkJEmbm8p3YEmWAgcD1wD7VNXd3VX3APtMYx+SJA2bOMCSPB/4O+D3quofh6+rqgJqG+NWJFmdZPXs7OykZUiSFpiJAizJrgzC64Kq+mzXfG+Sfbvr9wU2bW1sVa2sqmVVtWxmZmaSMiRJC9AkRyEGOAe4par+y9BVlwEnd5dPBi4dvzxJkrZu0QRjjwB+C7gpyQ1d2x8DZwMXJzkVuBN422QlSpK0pbEDrKq+AWQbVx897u1KktSHZ+KQJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDXJAJMkNckAkyQ1yQCTJDVp3gIsyTFJvpdkfZLT52s/kqSFaV4CLMkuwJ8DbwIOAk5MctB87EuStDDN1wzsMGB9Vf2gqh4FPgMsn6d9SZIWoPkKsP2Au4a2N3RtkiRNRapq+jeaHA8cU1W/3W3/FvAvq+rdQ31WACu6zV8Evjf1QgYWA/ft4ONaqHHccdY4nXEt1DjuOGuczrgWauzrpVU1M7JXVU39B3gt8OWh7TOAM+ZjXz1qWb2jj2uhxp35vlmj921H2tfOXOO0f+ZrCfE7wIFJDkiyG3ACcNk87UuStAAtmo8brarHk7wb+DKwC3BuVa2bj31JkhameQkwgKr6IvDF+br9OVjZwLgWahx3nDVOZ1wLNY47zhqnM66FGqdqXg7ikCRpvnkqKUlSkxZEgCX51hz67pnkP85nPdOS5D1JbklywfauZXNJliZZu73reCYt1NiSubzONhv34LRrmS9JPpTk/du7jmnYGZ7/CyLAqupfzaH7nkATAcagzjdW1du3dyHSHF9n2klkYLtkyYIIsDl+wjsb+IUkNyT56Bz2sUeSLyS5McnaJP+ux5il3Qzqr5OsS/KVJM/rub+/BF4GfCnJ7/fof3aS04a2R36STPKHSd7TXf54kiu6y0f1nPUtSnJBdx8vSbL7M+xraZJbk5yX5PvduDck+WaS25IcNqLWdyS5tvu9/VV3Ps7ekrwsyfVJDu3R96lae923oXGfT3Jd97teMar/0L7WDm2/P8mHeo49Kcl3u+fk/+w55oPd4/+NJBfOZbbxbM2kkvxJd6Lw3jUmeVf33Lghye1JrpzD/v7/Y8LgpAt9x72vey9Ym+T3evT/8HC/JGcleW+PcYd2v+fndu9D65K8qmeZu4z5/rO0+x18GlgL7N9zf9O1vf8Q7dn4AR6cQ9+lwNox9vFvgb8e2n5Bz309DvyLbvti4B1z2OcdwOKefQ8Gvja0fTOw/4gxhwN/213+OnAtsCtwJvAfety3Ao7ots8F3t/jsfhlBh+sruvGhMF5ND//DGP/GfC/gV277b8ATur7u2bwpnQ98Oo5PEd637ehcXt1/z6v2+/ec30+Au8HPtRj3CuB7z/1/Hhq3yPGvAa4Cdgd+DlgfZ/7NTS+9+ts3HHAocANwHOBnwVum2ONu3bP5bf27D/WYzI0bg/g+cA64OAev+s13eWfAf5vn+dI1/9PgY8xOIl6r5NGMMH7Tzf2SeDwcX7n0/pZEDOwZ8lNwBuTfCTJ66rqgZ7jbq+qG7rL1zF4YkxdVV0PvCjJi5O8GvhxVd01Yth1wGuS/BzwCPBtYBnwOgZvAqPcVVXf7C7/DfArI/rfXlU3VdWTDF7wq2rwarmJZ35cjmbwhvGdJDd02y/rUR/ADHAp8PaqurHnGJj7fQN4T5IbgasZfGI9cA77m6ujGHz4uA+gqu7vMeZ1wOeq6uGq+kd2zJMPHAFcWlX/VFU/ZfDBZS4+AVxRVX3HjfuY/Eo37qGqehD4bHdb21RVdwA/SnIw8KvA9VX1o577+zDwRgavzz/rOQYme/+5s6qunkP/qZu3vwNbaKrq+0kOAd4M/GmSVVX14R5DHxm6/ASDT+fz5W+B44GfBy4a1bmqHktyO3AK8C3gu8DrgZcDt/TY3+Z/ozHqbzaGH4snh7af5JmfqwHOr6ozetS0uQeAHzJ4w7l5DuPmdN+SHAm8AXhtVT2c5KsMZhGjPM7Tl/r7jNFWJDkFeCnw7hFdt6dPMXi9/TyDmX1fezOY6e3K4DnyUM9xk7z/9N3HvHEGtqWfMliamJMkLwYerqq/AT4KHDLtwqbgIgan9TqeQZj18XUGy1ZXdZffxeCTYZ8/IHxJktd2l38T+Mbcyu1tFXB8khcBJNkryUt7jn0U+DfASUl+cw77nOt9ewGDWe/DSX6JwfJsH/cymDnvneQ5wLE9x10B/EaSvWHwmPQYcxVwXJLnJflZ4K099/Vs+ibw1u77nufT8/FI8hoGz+N3dDP8vsZ9TL7ejds9yR4MnmN9Vi0+BxzDYKn0y3Oo86+APwEuAD4yh3FNWygzsN5/rV1VP+oOHFgLfKmq/rDn0F8GPprkSeAx4HfGqHNeVdW67kW4saru7jns68AHgW9X1UNJ/ol+L0QY/A8DpyU5l8Hs5pNzLrqHqro5yX8CvpLB0VCPAacBd/Yc/1CSY4HLkzxYVX2WieZ63/4BeFeSW7qxvZZeulnwhxl8/7gRuLXnuHVJzgK+luQJBt/xnTJizJokFwE3ApsYnNN0h1JV30lyGYPVgHsZLC/3Wa5/N7AXcGUSGJyI9rd77G+sx6Qbdx6D3xvAp7pl/FHjHu0OMPlJVT3RZ19JTgIeq6r/1R289K0kR1XVFX3Gt2ynPxNH9wl0TVX1/UQuPaMkS4G/r6q+R3o1qTva8cGq+tj2rmVYkudX1YPdkZ9XASuqas32rmsaug9ga4DfqKrbtnc9O7qdegmxW9b7NoOjcyTtHFZ2B+usAf5uJwqvgxgc5bjK8Opnp5+BSZJ2Tjv1DEyStPMywCRJTTLAJElNMsAkSU0ywCRJTTLAJElN+n8yzCjn0bwVXwAAAABJRU5ErkJggg==\n",
+ "text/plain": [
+ "<Figure size 432x288 with 1 Axes>"
+ ]
+ },
+ "metadata": {
+ "needs_background": "light"
+ },
+ "output_type": "display_data"
+ }
+ ],
+ "source": [
+ "fc = collections.Counter(sca)\n",
+ "plot_frequency_histogram(fc, sort_key=fc.get)"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 6,
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "abcdefghijklmnopqrstuvwxyz \n",
+ "\n"
+ ]
+ },
+ {
+ "data": {
+ "text/plain": [
+ "'harryiputtogetherateamofwomenfromthecomputingdivisionhereatkennedyandwehavespentmostofthelasteighteenmonthscombingthroughmissionfilesandcomputerprintoutslookingformorecluestothesourceoftheoxygentankexplosiononboardapolloxiiiandithinkwehavefinallyworkedoutwhathappenedthetankcontainingthesourceoftheexplosionwasoriginallyinstalledinapolloxbutremovedformodificationduringthatprocessitgotdroppedsoitwasheldbackforfurthertestsandareplacementfittedforthatflightonceithadpassedinspectionthetankwasreturnedtoserviceandearmarkedforodysseyfurtherupgradeswerecarriedouttoallowittorunoffgroundpowerduringfitoutattwicethespaceshipvoltageandthehigherpowerwasusedtoboiloffexcessoxygenduringgroundtestsunfortunatelyitlookslikethethermostaticswitchesinthetankwereoverlookedduringthevoltageupgradeandourbestguessisthattheyfusedclosedduringtheboiloffallowingthetemperaturetorisetooverathousanddegreesyoumightthinkthetestengineerswouldhavenoticedthatbutsincethetankoperatingtemperaturewassupposedtobesomewherewellbelowzerothedialonlywentasfaraspluseightysonoonewouldhavenoticedoperatingthatfaroutofnormalrangeitisamiraclethetanklastedaslongasitdidandthataddstotheimpressionthatthiswasasimpleaccidentachainofeventsthatcouldnothavebeenforeseenbutthecomputerfilestelladifferentstorywefoundtwoversionsoftheupgradereportwhichwaswrittentodetailtheproceduresformodifyingtheelectricalsystemonthetankthefirstgivesacomprehensivelistofthecablingswitchgearandcontrolsystemsthatneededtobehardenedforthegroundbasedvoltageitlistseverycriticalcomponentexceptthethermostaticvalvesthisdocumentwasfiledintheservicerecordsoweknowitwastheofficialrecordbutthechiefsystemsengineerwhosigneditoffsaysthesignatureonitisabadcopyofhisownwefoundidenticalcopiesinseveralmissionfilesbothinthemanufacturersrecordsandatkennedywheresomeofthetestswerecarriedoutsoitisclearthatthiswastheofficialversionusedintheupgradethesecondversionappearedtobethesamedocumentbutitincludedthethermostaticvalvesonthelistofcomponentstobechangedandthetemperaturegaugelimitswerecircledseveraltimeswithanexclamationmarknexttotheeightydegreeceilingitlookslikeoursaboteurdeliberatelyarrangedforthetanktobemisconfiguredinanefforttocausetroubleforthemissionalthoughwecantbesuretheyrealisedhowdangerousthiswaswhenweputittogetherwithalltheotheraccidentsitisprettyclearthiswasanotherdeliberateattackontheprogramwefoundthesecondversionofthereportinaboxunderthefloorboardsinmikesplaceisupposeitispossiblethatmikehadstumbledacrossthedocumenthimselfandwasinvestigatingitaspartofhiscampaigntoprovethattherussianswerebehindthisstringofproblemsbutattheveryleastheisguiltyofamajormisjudgementandiftheastronautshaddiedhewouldhavebeentriedformanslaughterasitistogetherwiththeleakchargeshewillbegoingtoprisonforaverylongtimeofcoursetheevidenceisstilllargelycircumstantialwecandefinitelytiehimtotheleaktothenewspaperforensicsmatchedthetypewriterribbonandtypecharacteristicsonhistypewriterwiththeinkandimpressionsonthelettertotheeditorbutwestillcannotshowconclusivelythathedirectedorcarriedoutanyofthesabotageattemptsandwehavenotbeenabletofindanyoneelsewhohadbothmotiveandopportunitysoheisourbestsuspectiamnotsurewecanentirelyrelaxbutwithnosignificantincidentsonapolloxivtoxviandwithmikeincustodyifeelslightlylessworriedabouttheremainingapolloflightwearestilltryingtocrackthatotherenciphereddocumentwefoundinmikesplaceithasaverystrangealphabetwhichithinkmustbesignificantbuticantquiteseehowtobreakityetnowthatthenasacomputingexpertshavemoretimeiamhopingthatweshouldbeabletodecipheritandthatitwillshedsomemorelightonmikesthinkingmoreimportantlyitmighttelluswhatelseifanythinghehadplannedmeg'"
+ ]
+ },
+ "execution_count": 6,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "k_a, score_b = vigenere_frequency_break(sca, fitness=Ptrigrams, max_key_length=26)\n",
+ "print(k_a, '\\n')\n",
+ "pa = vigenere_decipher(sca, k_a)\n",
+ "pa"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 7,
+ "metadata": {},
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "harry i put together a team of women from the computing division here at kennedy and we have spent\n",
+ "most of the last eighteen months combing through mission files and computer printouts looking for\n",
+ "more clues to the source of the oxygen tank explosion onboard apollo xiii and i think we have\n",
+ "finally worked out what happened the tank containing the source of the explosion was originally\n",
+ "installed in apollo x but removed for modification during that process it got dropped so it was held\n",
+ "back for further tests and a replacement fitted for that flight once it had passed inspection the\n",
+ "tank was returned to service and earmarked for odyssey further upgrades were carried out to allow it\n",
+ "to runoff ground power during fit out at twice the spaceship voltage and the higher power was used\n",
+ "to boil off excess oxygen during ground tests unfortunately it looks like the thermostatic switches\n",
+ "in the tank were overlooked during the voltage upgrade and our best guess is that they fused closed\n",
+ "during the boil off allowing the temperature to rise to over a thousand degrees you might think the\n",
+ "test engineers would have noticed that but since the tank operating temperature was supposed to be\n",
+ "somewhere well below zero the dial only went as far as plus eighty sono one would have noticed\n",
+ "operating that far out of normal range it is a miracle the tank lasted as long as it did and that\n",
+ "adds to the impression that this was a simple accident a chain of events that could not have been\n",
+ "foreseen but the computer file stella different story we found two versions of the upgrade report\n",
+ "which was written to detail the procedures for modifying the electrical system on the tank the first\n",
+ "gives a comprehensive list of the cabling switchgear and control systems that needed to be hardened\n",
+ "for the ground based voltage it lists every critical component except the thermostatic valves this\n",
+ "document was filed in the service records owe know it was the official record but the chief systems\n",
+ "engineer who signed it off says the signature on it is a badcopy of his own we found identical\n",
+ "copies in several mission files both in the manufacturers records and at kennedy where some of the\n",
+ "tests were carried out so it is clear that this was the official version used in the upgrade the\n",
+ "second version appeared to be the same document but it included the thermostatic valves on the list\n",
+ "of components to be changed and the temperature gauge limits were circled several times with an\n",
+ "exclamation mark next to the eighty degree ceiling it looks like our saboteur deliberately arranged\n",
+ "for the tank to be misconfigured in an effort to cause trouble for the mission although we cant be\n",
+ "sure they realised how dangerous this was when we put it together with all the other accidents it is\n",
+ "pretty clear this was another deliberate attack on the program we found the second version of the\n",
+ "report in a box under the floorboards in mikes place i suppose it is possible that mike had stumbled\n",
+ "across the document himself and was investigating it as part of his campaign to prove that the\n",
+ "russians were behind this string of problems but at the very least he is guilty of a major\n",
+ "misjudgement and if the astronauts had died he would have been tried for manslaughter as it is\n",
+ "together with the leak charges he will be going to prison for a very longtime of course the evidence\n",
+ "is still largely circumstantial we can definitely tie him to the leak to the newspaper forensics\n",
+ "matched the typewriter ribbon and type characteristics on his typewriter with the ink and\n",
+ "impressions on the letter to the editor but we still can not show conclusively that he directed or\n",
+ "carried out any of the sabotage attempts and we have not be enable to find anyone else who had both\n",
+ "motive and opportunity so he is our best suspect i am not sure we can entirely relax but with no\n",
+ "significant incidents on apollo xiv to xvi and with mike in custody i feel slightly less worried\n",
+ "about the remaining apollo flight we are still trying to crack that other enciphered document we\n",
+ "found in mikes place it has a very strange alphabet which i think must be significant but icant\n",
+ "quite see how to break it yet now that the nasa computing experts have more time i am hoping that we\n",
+ "should be able to decipher it and that it will shed some more light on mikes thinking more\n",
+ "importantly it might tell us what elseif anything he had planned meg\n"
+ ]
+ }
+ ],
+ "source": [
+ "print(lcat(tpack(segment(pa))))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 8,
+ "metadata": {},
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "4375"
+ ]
+ },
+ "execution_count": 8,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "open(plaintext_a_filename, 'w').write(lcat(tpack(segment(pa))))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": []
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 3",
+ "language": "python",
+ "name": "python3"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 3
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython3",
+ "version": "3.6.9"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
projects / cipher-tools.git / blobdiff